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Definition
  
  ① 타액선 조직에서 발생한 epithelium-lined cavity

Cinical feature
  
  ① adult에 보통 발생
  ② major, minor glands에서 둘다 발생
  ③ parotid gland에서 가장 빈번
  ④ slowly growing, asymptomatic swelling
  ⑤ floor of mouth, buccal mucosa, lips

Histopatholgic features
  
  ① lumen안에thin,mucoidsecretion을둘러싸는cuboidal,columnar, atrophic squamous  epithelium

Treatment and prognosis

  ① conservative surgical excision